V6NetHandle: NET6-2001-4F8-1 OrgID: ISC-94 Parent: NET6-2001-400-0 NetName: ISC6-1 NetRange: 2001:4F8:: - 2001:4F8:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation RegDate: 2002-08-02 Updated: 2013-03-01 TechHandle: ISCN-ARIN Source: ARIN OrgID: ISC-94 OrgName: Internet Systems Consortium, Inc. CanAllocate: Street: 950 Charter Street City: Redwood City State/Prov: CA Country: US PostalCode: 94063 RegDate: 2004-01-09 Updated: 2018-04-16 OrgNOCHandle: ISCN-ARIN OrgAdminHandle: ISCN-ARIN OrgAbuseHandle: ISCAT-ARIN OrgTechHandle: JSO127-ARIN OrgTechHandle: BKR-ARIN OrgTechHandle: ISCN-ARIN Source: ARIN
IP address ranges, or netblocks, are groups of related IP addresses. They are usually represented as a base IP address, followed by a slash, and then a netmask which represents how many IP addresses are contained within the netblock. This format is known as CIDR. You'll also sometimes see netblocks given as a start ip address, and an end ip address, or an ip address range.
Traffic works its way around the internet based on the routing table, which contains a list of networks and their associated netblocks.